init: Fix several memory leaks

1. Fix fd leak in do_mount function
2. Fix file1 and file2 leak in process_firmware_event function

Change-Id: Ic4271f2cf5e1df3cd32265544764a22b42271213
Signed-off-by: Hong-Mei Li <a21834@motorola.com>
Reviewed-on: http://gerrit.pcs.mot.com/563988
SLTApproved: Slta Waiver <sltawvr@motorola.com>
Tested-by: Jira Key <jirakey@motorola.com>
Reviewed-by: Yi-Wei Zhao <gbjc64@motorola.com>
SLTApproved: Yi-Wei Zhao <gbjc64@motorola.com>
Reviewed-by: Sheng-Zhe Zhao <a18689@motorola.com>
Submit-Approved: Jira Key <jirakey@motorola.com>
(cherry picked from commit 0f13608cf4d753e494ea5ba848bdd67dcf59c317)